- Length
- 4 m
- Diet
- Plant-eater
- When
- Late Cretaceousabout 66 million years ago
- Fossils found in
- USA
- Named by
- Bakker, Sullivan, Porter, Larson and Saulsbury (2006)
- Family tree
- Dinosauria › Ornithischia › Neornithischia › Cerapoda › Marginocephalia › Pachycephalosauria › Pachycephalosauridae
Pachycephalosaurs. Two-legged plant-eaters with thick, domed skulls. See all 8
Lived at the same time
- Alamosaurus · same country
- Ankylosaurus · same country
- Dryptosaurus · same country
- Leptoceratops · same country
- Nedoceratops · same country
- Ornithomimus · same country
- Pachycephalosaurus · same country
- Stygimoloch · same country
Other pachycephalosaurs
- Stygimoloch Late Cretaceous
- Pachycephalosaurus Late Cretaceous
- Homalocephale Late Cretaceous
- Tylocephale Late Cretaceous
- Stegoceras Late Cretaceous
- Prenocephale Late Cretaceous
- Goyocephale Late Cretaceous
Source: Dracorex in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.